Cache Headers Analyzer - Cache-Control, ETag, CDN Verdict

Audit HTTP caching response headers (Cache-Control, Expires, ETag, Last-Modified, Vary, Age). Optionally tests conditional revalidation using If-None-Match / If-Modified-Since. Useful for web performance tuning and debugging CDN/browser caching behavior.

Inspect full HTTP response headers of any URL. Input: urls array. Output: JSON per URL with every response header, security analysis (HSTS, CSP, X-Frame-Options, etc.), and server fingerprint. Priced per URL checked - predictable pay-per-result, no subscription.

Test the CORS configuration of any URL or API endpoint. Input: urls array + optional origin/method to test. Output: JSON per URL with actual and preflight (OPTIONS) Access-Control-* headers, allowed origins and methods, and misconfiguration flags. Priced per URL checked.

Audit how a URL is served: HTTPS, HTTP/2, HTTP/3 (Alt-Svc), Brotli vs gzip compression, cache headers, ETag, HSTS. Returns A-F grade + perf punch-list. Use for web performance audits, CDN verification, hosting QA. Input: url or urls[]. Output: JSON report.

Cloudflare API - DNS, Zones, Cache & Security

alizarin_refrigerator-owner/cloudflare-api---dns-zones-cache-security

Manage your Cloudflare infrastructure programmatically. Configure DNS records, manage zones, purge cache, set up page rules, and control security settings through a single interface. Features Zone Management DNS Management Cache Control Page Rules Security & Analytics

HTTP Headers Checker - Security Header Audit

benthepythondev/http-headers-checker

Check HTTP response headers for websites, including status code, server, cache settings, redirects and common security headers.

Check whether a website is up, on demand. Input: urls array (one or many). Output: JSON per URL with up/down result, HTTP status code, latency in ms, and SSL certificate validity. Priced per URL checked - cheap pay-per-result monitoring without a subscription.

HTTP Header Diff Monitor

junipr/http-header-diff-monitor

Compare previous/current HTTP headers and show exact added/removed/changed security/cache/CORS headers.

Check HTTP status codes for a list of URLs in bulk. Input: urls array. Output: JSON per URL with final status code, full redirect chain, and response time. Find dead pages and broken links fast. Priced per URL checked - cheap, predictable pay-per-result.

Measure detailed response timing for any URL. Input: urls array. Output: JSON per URL with DNS lookup time, TCP/TLS connect time, TTFB, total transfer time, and payload size. Spot slow pages and backend bottlenecks. Priced per URL checked - cheap pay-per-result.